/*
 *  mksp.c
 *
 *  Generate SP tables for DES-150 library
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include <stdio.h>

/*
 * sboxes - the tables for the s-box functions
 *        from FIPS 46, pages 15-16.
 */
unsigned char S[8][64] = {
    /* Func S1 = */
    { 14, 0, 4, 15, 13, 7, 1, 4, 2, 14, 15, 2, 11, 13, 8, 1,
      3, 10, 10, 6, 6, 12, 12, 11, 5, 9, 9, 5, 0, 3, 7, 8,
      4, 15, 1, 12, 14, 8, 8, 2, 13, 4, 6, 9, 2, 1, 11, 7,
      15, 5, 12, 11, 9, 3, 7, 14, 3, 10, 10, 0, 5, 6, 0, 13 },
    /* Func S2 = */
    { 15, 3, 1, 13, 8, 4, 14, 7, 6, 15, 11, 2, 3, 8, 4, 14,
      9, 12, 7, 0, 2, 1, 13, 10, 12, 6, 0, 9, 5, 11, 10, 5,
      0, 13, 14, 8, 7, 10, 11, 1, 10, 3, 4, 15, 13, 4, 1, 2,
      5, 11, 8, 6, 12, 7, 6, 12, 9, 0, 3, 5, 2, 14, 15, 9 },
    /* Func S3 = */
    { 10, 13, 0, 7, 9, 0, 14, 9, 6, 3, 3, 4, 15, 6, 5, 10,
      1, 2, 13, 8, 12, 5, 7, 14, 11, 12, 4, 11, 2, 15, 8, 1,
      13, 1, 6, 10, 4, 13, 9, 0, 8, 6, 15, 9, 3, 8, 0, 7,
      11, 4, 1, 15, 2, 14, 12, 3, 5, 11, 10, 5, 14, 2, 7, 12 },
    /* Func S4 = */
    { 7, 13, 13, 8, 14, 11, 3, 5, 0, 6, 6, 15, 9, 0, 10, 3,
      1, 4, 2, 7, 8, 2, 5, 12, 11, 1, 12, 10, 4, 14, 15, 9,
      10, 3, 6, 15, 9, 0, 0, 6, 12, 10, 11, 1, 7, 13, 13, 8,
      15, 9, 1, 4, 3, 5, 14, 11, 5, 12, 2, 7, 8, 2, 4, 14 },
    /* Func S5 = */
    { 2, 14, 12, 11, 4, 2, 1, 12, 7, 4, 10, 7, 11, 13, 6, 1,
      8, 5, 5, 0, 3, 15, 15, 10, 13, 3, 0, 9, 14, 8, 9, 6,
      4, 11, 2, 8, 1, 12, 11, 7, 10, 1, 13, 14, 7, 2, 8, 13,
      15, 6, 9, 15, 12, 0, 5, 9, 6, 10, 3, 4, 0, 5, 14, 3 },
    /* Func S6 = */
    { 12, 10, 1, 15, 10, 4, 15, 2, 9, 7, 2, 12, 6, 9, 8, 5,
      0, 6, 13, 1, 3, 13, 4, 14, 14, 0, 7, 11, 5, 3, 11, 8,
      9, 4, 14, 3, 15, 2, 5, 12, 2, 9, 8, 5, 12, 15, 3, 10,
      7, 11, 0, 14, 4, 1, 10, 7, 1, 6, 13, 0, 11, 8, 6, 13 },
    /* Func S7 = */
    { 4, 13, 11, 0, 2, 11, 14, 7, 15, 4, 0, 9, 8, 1, 13, 10,
      3, 14, 12, 3, 9, 5, 7, 12, 5, 2, 10, 15, 6, 8, 1, 6,
      1, 6, 4, 11, 11, 13, 13, 8, 12, 1, 3, 4, 7, 10, 14, 7,
      10, 9, 15, 5, 6, 0, 8, 15, 0, 14, 5, 2, 9, 3, 2, 12 },
    /* Func S8 = */
    { 13, 1, 2, 15, 8, 13, 4, 8, 6, 10, 15, 3, 11, 7, 1, 4,
      10, 12, 9, 5, 3, 6, 14, 11, 5, 0, 0, 14, 12, 9, 7, 2,
      7, 2, 11, 1, 4, 14, 1, 7, 9, 4, 12, 10, 14, 8, 2, 13,
      0, 15, 6, 12, 10, 9, 13, 0, 15, 3, 3, 5, 5, 6, 8, 11 }
};

/*
 * Permutation function for results from s-boxes
 *   from FIPS 46 pages 12 and 16.
 * P =
 */
unsigned char P[32] = {
    16, 7, 20, 21, 29, 12, 28, 17,
    1, 15, 23, 26, 5, 18, 31, 10,
    2, 8, 24, 14, 32, 27, 3, 9,
    19, 13, 30, 6, 22, 11, 4, 25
};

unsigned int Pinv[32];
unsigned int SP[8][64];

void
makePinv(void)
{
    int i;
    unsigned int Pi = 0x80000000;
    for (i = 0; i < 32; ++i) {
        int j = 32 - P[i];
        Pinv[j] = Pi;
        Pi >>= 1;
    }
}

void
makeSP(void)
{
    int box;
    for (box = 0; box < 8; ++box) {
        int item;
        printf("/* box S%d */ {\n", box + 1);
        for (item = 0; item < 64; ++item) {
            unsigned int s = S[box][item];
            unsigned int val = 0;
            unsigned int bitnum = (7 - box) * 4;
            for (; s; s >>= 1, ++bitnum) {
                if (s & 1) {
                    val |= Pinv[bitnum];
                }
            }
            val = (val << 3) | (val >> 29);
            SP[box][item] = val;
        }
        for (item = 0; item < 64; item += 4) {
            printf("\t0x%08x, 0x%08x, 0x%08x, 0x%08x,\n",
                   SP[box][item], SP[box][item + 1], SP[box][item + 2], SP[box][item + 3]);
        }
        printf("    },\n");
    }
}

int
main()
{
    makePinv();
    makeSP();
    return 0;
}
